JPS63181545A - Signal multiplex transmission method - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a signal multiplex transmission system for wiring between printed circuit boards of computers or between devices.

[Background Art] In recent years, with the development of semiconductor integrated circuits, digital communication devices and control devices (hereinafter simply referred to as digital devices) such as computers have become significantly more sophisticated and complex.

Generally, these digital devices are made up of several to several dozen printed circuit boards, and are housed in one housing.

Each printed circuit board
3 oard.

There are input/output terminals on the PCB (hereinafter abbreviated as PCB).
Each PC is interconnected via a dedicated connector with interconnecting wires.
Wiring is provided between B. That is, 11a in FIG.
, 11b, and -112 all refer to PCBs as circuit block units, and these PCBs are connected by interconnection wires 12. Each PC [3(
11a.

11b, . . . 11z).The number of lines entering and leaving the terminals (11b, . . . 11z) is at most 20 to 30, and at most over 100.

Such conventional wiring methods have the following problems.

Medium For all connections, it is decided in advance which terminal of which PCB is connected to which terminal of other PCB, and the wiring work is performed according to this, but this work is extremely troublesome, and wiring mistakes are often made. Checking the wiring was also not easy.

(2) Because there are a large number of wires, problems such as wire breakage and core wire contact occur, leading to reliability problems.Also, even if there is a problem such as wire breakage or core wire contact, it is difficult to locate the location. Met.

(3) Once the wiring work was completed, it was difficult to change the wiring.

(4) Sign distortion caused by the electric wire became a problem when the distance between the two points was a little apart.

(5) Code errors could occur due to crosstalk between adjacent lines.

[Problems to be Solved by the Invention] As mentioned above, in the conventional wiring method in which interconnection between circuit blocks was performed entirely by hardware, the number of wires was large, making the wiring work complicated and reducing reliability. There was a problem with missing parts.

SUMMARY OF THE INVENTION An object of the present invention is to provide a new signal multiplexing transmission system that is easy to connect and has high reliability by solving the above-described drawbacks of the prior art using software.

[Means for Solving the Problems] The signal multiplexing transmission method of the present invention has a selector that multiplexes lines for inputting and outputting each block in a system consisting of a plurality of circuit blocks, and a selector that multiplexes lines for inputting and outputting the circuit blocks. It includes a scanner that sends out address signals in an arbitrary order via an address bus to select lines, and a data bus that connects input and output lines of each circuit block selected by a selector. Addresses are assigned to all input/output lines in advance so that all input/output lines of each circuit block can be uniquely Rm, and an address signal that sequentially specifies these addresses is sent from a scanner to a selector via an address bus. The selector that receives this selects the output line of the specified address and sends only the signal of the output line to the data bus, or the signal sent from the data bus is input to the specified address. This is to transmit signals between any input/output points in the system by inputting only to the line.

[Operation] When the coscanner scans once, the selector operates to transmit signals on a set of input/output lines between each circuit block, and by sequentially changing the address to be scanned, all the signals in the system are transmitted. Signal transmission between input and output lines is performed.

The number of output lines for each circuit block selected by the scanner is one input line and one output line, respectively, by the scanner, the selector, and a set of firmware or software that assigns addresses to all input and output lines of each circuit block. The number of path lines that directly connect circuit blocks using hardware is reduced.

[Example] An example of the present invention will be described below based on FIGS. 1 to 7. FIG. 1 shows an example of a system configuration implementing the signal multiplex transmission system of the present invention.

In the same figure, PCBl 1a , 1 lb , -=11
fiber optic address buses 22a, 22b for
.

...22z is derived from the gap 11 and 21, and the signal branched by the optical splitter 23 is sent to the branch optical fiber 25a.
, 25b, -25z to each PCB 11a, 11b.
, -A1z. In each PCB, addresses (individual identification numbers) are assigned to all input/output points in advance, and only the output point with a specific number specified by the scanner 21 passes through the optical fiber 26 and the branch pipe 23a to the optical fiber. The output optical signal is transmitted to the data bus 24, and only the input point of a designated specific number receives the input optical signal from the data bus 24 using an optical fiber via the branching device 23b. By sequentially shifting the points designated by the scanner 21 as shown in FIG. 3, it becomes possible to transmit and receive data between any two desired points.

In this case, by assigning the same address to a plurality of different receiving points, simultaneous reception is possible at the plurality of points. For example, if you prepare 10 address lines, 2
It is now possible to transmit 0 or 1024 pairs, and the transmission point,
If the reception points are also in one-to-one correspondence, it is possible to scan up to 2048 terminals.

Next, the periphery of each PCB will be explained in detail based on FIG. 2.

PCB 110 includes a circuit block 35 and a selector 34. Brancher 23a for data bus 24
Signals are transmitted from the PCB 110 side via the (operates as a confluencer) and are taken out to the optical fiber data bus 24. On the other hand, the signal is branched by the branching device 23b and taken into the PCB 110 side.

Here, in the circuit block 35, a large number of signal output lines 3
6a, there is a signal input hllA36b. These input/output lines are combined by the selector 34 into a selector output terminal 37a for output and a selector input terminal 37b for input. The selector 34 has the same function as a rotary switch. That is, address bus 25a.

The optical address signals input from 25b, . . . 25z are partially converted into electrical signals by the optical receivers 318, 31b, . An electrical output signal output only from the numbered output line is taken out from the selector output terminal 37a,
The optical transmitter 33 converts the signal into an optical signal and outputs it to the data bus 24.

On the other hand, the optical signal that enters the PCB 110 from the data bus 24 side is returned to an electrical signal by the optical receiver 32, enters the selector 34 from the selector input terminal 37b, and then is sent from the PCB 110 side to the pass line 24. By the same operation as explained when outputting to signal human power llA36b
It will be imported only to the input line with the number selected from among them.

As described above, according to this embodiment, by introducing the selector, the signal line going in and out from the PCB is reduced to one input,
By consolidating the outputs into one line and connecting them to a pass line for wiring between PCBs (or between electronic devices), wiring work time is significantly shortened and the hassle of checking wiring is eliminated. It disappears.

Furthermore, since the number of wires between 808 is small and optical fibers are used for the wires, there are no problems such as disconnection or core wire contact, and the reliability is high.

Furthermore, addresses are attached to the inputs and outputs of the circuit blocks, and connections are made between the inputs and outputs of each circuit block by specifying these addresses, so if you want to change the connection between the inputs and outputs, you can Rather than changing the connection between the Not at all.

Furthermore, since optical signals are used, they are resistant to induction, have a wide band, and have no problems with code distortion or crosstalk, and especially in the case of the above-mentioned bus type configuration using an optical splitter, transmission delay time is particularly small.

As described above, this system has various advantages, and in the near future optical transceivers are expected to become extremely low-priced even at high speeds of several hundred Mb/s, so this system can be implemented at a low cost. , its practical value is great.

4 to 7 show modifications of the embodiment shown in FIG. 1, in which branching and combining in the address bus 22 and data bus 24 is performed in the electrical domain. 28 and 29 are optical transceivers, respectively. In the case of a configuration in which branching and combining is performed in the 7n region, the transmission delay time becomes long, but branching can be easily performed and the system is extremely easy to implement.

The one in Fig. 5 shows the case where a star coupler 13 is used for the data bus, and the system configuration is simpler because only a star coupler is required for the optical device, rather than using a splitter and combiner as shown in Fig. 1. becomes.

In the case shown in FIG. 6, the signal of the data bus 24 is once passed through a solid device 71 to each PCB 11a.

11b... 72° and 73 are optical transceivers. If the solid device 71 is provided with a memory or a microcomputer, the status of each PCB can be centrally managed. Furthermore, data transmission in the initial state, that is, data transmission from the solid device to the PCB, becomes possible when the system is started. Furthermore, if the solid device 71 is backed up with a battery, the state of each part can be memorized even in the event of a system power outage, making recovery easier.

FIG. 7 shows a case where there are a plurality of data buses 24a and 24b.

As another modification, instead of scanning sequentially in numerical order, the scan period of faster terminals may be shortened. This allows efficient signal transmission. In addition, although the above-mentioned embodiments and modified examples have all been described in the case of PCB, they can also be applied to general equipment and circuit blocks, and furthermore, it is possible to use a guiding waveguide instead of an optical fiber, or to prevent sign distortion and crosstalk. Although there are problems, it is also possible to use a simple electric wire.

[Effects of the Invention] To summarize, according to the present invention, since the scanner and selector sequentially shift the time and multiplex transmit the signals, unlike the conventional method in which one-to-one individual wiring is performed, Since the signal lines going in and out of each circuit block can be greatly consolidated, the wiring work is easy and highly reliable, which is an excellent effect.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an example of a system for implementing the signal multiplex transmission system of the present invention, FIG. 2 is a partial detailed diagram of FIG. 1,
FIG. 3 is a timing chart explaining the output of the scanner shown in FIG. 1 or 2, FIGS. 4 to 7 are configuration diagrams showing modified examples of the system according to the present invention, and FIG. FIG. 2 is a wiring diagram illustrating a wiring method between the PCBs that have been installed. In the figure, lla, 11b, -11z are circuit blocks, 21
24 is a data bus, 34 is a selector, 35
is a circuit block, 36a is an output line of the circuit block,
36b is an input line of the circuit block, and 71 is a solid device. Patent applicant Hitachi M-Sen Co., Ltd. Representative Patent Attorney
Nobuo Kinuya 3b Figure 8

Claims (2)

[Claims] (1) A plurality of circuit blocks, a selector that multiplexes the input/output lines of each block, a scanner that sends an address signal to the selector to select the input/output line of the circuit block, and a scanner that is selected by the selector. A data bus is provided that connects the input/output lines of each circuit block, and addresses are assigned to all input/output lines of each circuit block in advance, and address signals specifying the addresses sequentially are sent from the scanner to the selector. Then, upon receiving this, the selector selects the output line of the specified address and sends only the signal of the output line to the data bus, or sends the signal sent from the data bus to the specified address. A signal multiplex transmission method characterized by transmitting signals between arbitrary input/output lines between circuit blocks by capturing only the input lines. (2) A patent claim characterized in that the signal output sent from the selected output line of each of the circuit blocks to the data bus is transmitted once through a central device and then sent again to each circuit block. The method described in item 1 of the scope of